Wow, I can't believe this actually happens. I main a resto Shammy and constantly get compliments on my healing. Half the people in my guild can't believe how easily I can keep a group up. Granted we still haven't gotten into raiding, so this is still just in heroics. But once you get half ways decent gear, heroics are wicked easy to heal. You should never vote kick a healer without at least giving them a chance. It's just like any other role, a good player on a slightly underpowered class can be competitive.